CVE-2024-36966

erofs: reliably distinguish block based and fscache mode

Description

In the Linux kernel, the following vulnerability has been resolved: erofs: reliably distinguish block based and fscache mode When erofs_kill_sb() is called in block dev based mode, s_bdev may not have been initialised yet, and if CONFIG_EROFS_FS_ONDEMAND is enabled, it will be mistaken for fscache mode, and then attempt to free an anon_dev that has never been allocated, triggering the following warning: ============================================ ida_free called for id=0 which is not allocated. WARNING: CPU: 14 PID: 926 at lib/idr.c:525 ida_free+0x134/0x140 Modules linked in: CPU: 14 PID: 926 Comm: mount Not tainted 6.9.0-rc3-dirty #630 RIP: 0010:ida_free+0x134/0x140 Call Trace: <TASK> erofs_kill_sb+0x81/0x90 deactivate_locked_super+0x35/0x80 get_tree_bdev+0x136/0x1e0 vfs_get_tree+0x2c/0xf0 do_new_mount+0x190/0x2f0 [...] ============================================ Now when erofs_kill_sb() is called, erofs_sb_info must have been initialised, so use sbi->fsid to distinguish between the two modes.

N/A

CVSS

Severity:

EPSS 0.12%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/f9b877a7ee312ec8ce17598a7ef85cb820d7c371
https://git.kernel.org/stable/c/dcdd49701e429c55b3644fd70fc58d85745f8cfe
https://git.kernel.org/stable/c/7af2ae1b1531feab5d38ec9c8f472dc6cceb4606

Frequently Asked Questions

What is the severity of CVE-2024-36966?: CVE-2024-36966 has not yet been assigned a CVSS score.
How to fix CVE-2024-36966?: To fix CVE-2024-36966, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-36966 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-36966 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-36966?: CVE-2024-36966 affects Linux Linux, Linux Linux.

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